Transportflotte Speer [off topic]
 

Includes vessels made of concrete if I'm reading it correctly. From a German site:



"The authors Theodor Dorgeist and Günther Meyer enrich the stock of marine literature with their book "Transportfleet Speer - Paramilitary transport and construction organization in the Second World War and their ship inventory".
This book is the first in a publication that presents the existence of the transport fleet Speer and the organization Todt. In 50 years determined Theodor Dorgeist and Günther Meyer, separated only by West and East, from well over 2000 units about 1700 ships and boats, from the Toulon passenger steamer to the cutter in Kirkenes. The highlight of the work is the section with 150 concrete vessels! Furthermore, the approximately 200 converted Motor Wiking ships are brought with data and CV."


http://www.christian-schmidt.com/pro...ducts_id=10363




Usual disclaimer,
Ed